The equation has the form Ax +By = C
In this equation, A=3, B=4 and C=12
We need to put it in the form y+Dx=E.
To do this we need to divide through by the coeffecient of y (4 in this case)
This would give us
y + 0.75x = 3
The constant term is the y intercept
So the y intercept of this line is 3 (this occurs when x=0)